Andrew Liszewski

Rolex is known for its industrial-strength Submariner dive watches that can take more of a licking than a Timex. But Tudor, Rolex's baby brother, might steal its thunder with a watch that tightens around a diver's wrist the deeper they go.

The new Pelagos features an extending clasp—like most professional dive watches—allowing it to be worn over a thick wetsuit. But the deeper you go underwater, the more pressure there is acting against you. Which causes a wet suit, and even your body, to compress. When that happens, a watch that was tight when you first entered the water, won't be anymore.

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So the clasp on the Pelagos features a special mechanism that contracts as you go deeper and deeper, ensuring your watch doesn't slip off and end up in Davy Jones' locker. And while Tudor is often looked at as being a cheaper alternative to a Rolex, you'll still have to fork—or trident—out around $4,400 to own one. [Tudor via Hodinkee]